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0001 // SPDX-License-Identifier: GPL-2.0
0002 #include <linux/kernel.h>
0003 #include <linux/serial.h>
0004 #include <linux/serial_8250.h>
0005 #include <linux/serial_core.h>
0006 #include <linux/console.h>
0007 #include <linux/pci.h>
0008 #include <linux/of_address.h>
0009 #include <linux/of_device.h>
0010 #include <linux/of_irq.h>
0011 #include <linux/serial_reg.h>
0012 #include <asm/io.h>
0013 #include <asm/mmu.h>
0014 #include <asm/serial.h>
0015 #include <asm/udbg.h>
0016 #include <asm/pci-bridge.h>
0017 #include <asm/ppc-pci.h>
0018 #include <asm/early_ioremap.h>
0019 
0020 #undef DEBUG
0021 
0022 #ifdef DEBUG
0023 #define DBG(fmt...) do { printk(fmt); } while(0)
0024 #else
0025 #define DBG(fmt...) do { } while(0)
0026 #endif
0027 
0028 #define MAX_LEGACY_SERIAL_PORTS 8
0029 
0030 static struct plat_serial8250_port
0031 legacy_serial_ports[MAX_LEGACY_SERIAL_PORTS+1];
0032 static struct legacy_serial_info {
0033     struct device_node      *np;
0034     unsigned int            speed;
0035     unsigned int            clock;
0036     int             irq_check_parent;
0037     phys_addr_t         taddr;
0038     void __iomem            *early_addr;
0039 } legacy_serial_infos[MAX_LEGACY_SERIAL_PORTS];
0040 
0041 static const struct of_device_id legacy_serial_parents[] __initconst = {
0042     {.type = "soc",},
0043     {.type = "tsi-bridge",},
0044     {.type = "opb", },
0045     {.compatible = "ibm,opb",},
0046     {.compatible = "simple-bus",},
0047     {.compatible = "wrs,epld-localbus",},
0048     {},
0049 };
0050 
0051 static unsigned int legacy_serial_count;
0052 static int legacy_serial_console = -1;
0053 
0054 static const upf_t legacy_port_flags = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST |
0055     UPF_SHARE_IRQ | UPF_FIXED_PORT;
0056 
0057 static unsigned int tsi_serial_in(struct uart_port *p, int offset)
0058 {
0059     unsigned int tmp;
0060     offset = offset << p->regshift;
0061     if (offset == UART_IIR) {
0062         tmp = readl(p->membase + (UART_IIR & ~3));
0063         return (tmp >> 16) & 0xff; /* UART_IIR % 4 == 2 */
0064     } else
0065         return readb(p->membase + offset);
0066 }
0067 
0068 static void tsi_serial_out(struct uart_port *p, int offset, int value)
0069 {
0070     offset = offset << p->regshift;
0071     if (!((offset == UART_IER) && (value & UART_IER_UUE)))
0072         writeb(value, p->membase + offset);
0073 }
0074 
0075 static int __init add_legacy_port(struct device_node *np, int want_index,
0076                   int iotype, phys_addr_t base,
0077                   phys_addr_t taddr, unsigned long irq,
0078                   upf_t flags, int irq_check_parent)
0079 {
0080     const __be32 *clk, *spd, *rs;
0081     u32 clock = BASE_BAUD * 16;
0082     u32 shift = 0;
0083     int index;
0084 
0085     /* get clock freq. if present */
0086     clk = of_get_property(np, "clock-frequency", NULL);
0087     if (clk && *clk)
0088         clock = be32_to_cpup(clk);
0089 
0090     /* get default speed if present */
0091     spd = of_get_property(np, "current-speed", NULL);
0092 
0093     /* get register shift if present */
0094     rs = of_get_property(np, "reg-shift", NULL);
0095     if (rs && *rs)
0096         shift = be32_to_cpup(rs);
0097 
0098     /* If we have a location index, then try to use it */
0099     if (want_index >= 0 && want_index < MAX_LEGACY_SERIAL_PORTS)
0100         index = want_index;
0101     else
0102         index = legacy_serial_count;
0103 
0104     /* if our index is still out of range, that mean that
0105      * array is full, we could scan for a free slot but that
0106      * make little sense to bother, just skip the port
0107      */
0108     if (index >= MAX_LEGACY_SERIAL_PORTS)
0109         return -1;
0110     if (index >= legacy_serial_count)
0111         legacy_serial_count = index + 1;
0112 
0113     /* Check if there is a port who already claimed our slot */
0114     if (legacy_serial_infos[index].np != NULL) {
0115         /* if we still have some room, move it, else override */
0116         if (legacy_serial_count < MAX_LEGACY_SERIAL_PORTS) {
0117             printk(KERN_DEBUG "Moved legacy port %d -> %d\n",
0118                    index, legacy_serial_count);
0119             legacy_serial_ports[legacy_serial_count] =
0120                 legacy_serial_ports[index];
0121             legacy_serial_infos[legacy_serial_count] =
0122                 legacy_serial_infos[index];
0123             legacy_serial_count++;
0124         } else {
0125             printk(KERN_DEBUG "Replacing legacy port %d\n", index);
0126         }
0127     }
0128 
0129     /* Now fill the entry */
0130     memset(&legacy_serial_ports[index], 0,
0131            sizeof(struct plat_serial8250_port));
0132     if (iotype == UPIO_PORT)
0133         legacy_serial_ports[index].iobase = base;
0134     else
0135         legacy_serial_ports[index].mapbase = base;
0136 
0137     legacy_serial_ports[index].iotype = iotype;
0138     legacy_serial_ports[index].uartclk = clock;
0139     legacy_serial_ports[index].irq = irq;
0140     legacy_serial_ports[index].flags = flags;
0141     legacy_serial_ports[index].regshift = shift;
0142     legacy_serial_infos[index].taddr = taddr;
0143     legacy_serial_infos[index].np = of_node_get(np);
0144     legacy_serial_infos[index].clock = clock;
0145     legacy_serial_infos[index].speed = spd ? be32_to_cpup(spd) : 0;
0146     legacy_serial_infos[index].irq_check_parent = irq_check_parent;
0147 
0148     if (iotype == UPIO_TSI) {
0149         legacy_serial_ports[index].serial_in = tsi_serial_in;
0150         legacy_serial_ports[index].serial_out = tsi_serial_out;
0151     }
0152 
0153     printk(KERN_DEBUG "Found legacy serial port %d for %pOF\n",
0154            index, np);
0155     printk(KERN_DEBUG "  %s=%llx, taddr=%llx, irq=%lx, clk=%d, speed=%d\n",
0156            (iotype == UPIO_PORT) ? "port" : "mem",
0157            (unsigned long long)base, (unsigned long long)taddr, irq,
0158            legacy_serial_ports[index].uartclk,
0159            legacy_serial_infos[index].speed);
0160 
0161     return index;
0162 }
0163 
0164 static int __init add_legacy_soc_port(struct device_node *np,
0165                       struct device_node *soc_dev)
0166 {
0167     u64 addr;
0168     const __be32 *addrp;
0169     struct device_node *tsi = of_get_parent(np);
0170 
0171     /* We only support ports that have a clock frequency properly
0172      * encoded in the device-tree.
0173      */
0174     if (of_get_property(np, "clock-frequency", NULL) == NULL)
0175         return -1;
0176 
0177     /* if reg-offset don't try to use it */
0178     if ((of_get_property(np, "reg-offset", NULL) != NULL))
0179         return -1;
0180 
0181     /* if rtas uses this device, don't try to use it as well */
0182     if (of_get_property(np, "used-by-rtas", NULL) != NULL)
0183         return -1;
0184 
0185     /* Get the address */
0186     addrp = of_get_address(soc_dev, 0, NULL, NULL);
0187     if (addrp == NULL)
0188         return -1;
0189 
0190     addr = of_translate_address(soc_dev, addrp);
0191     if (addr == OF_BAD_ADDR)
0192         return -1;
0193 
0194     /* Add port, irq will be dealt with later. We passed a translated
0195      * IO port value. It will be fixed up later along with the irq
0196      */
0197     if (of_node_is_type(tsi, "tsi-bridge"))
0198         return add_legacy_port(np, -1, UPIO_TSI, addr, addr,
0199                        0, legacy_port_flags, 0);
0200     else
0201         return add_legacy_port(np, -1, UPIO_MEM, addr, addr,
0202                        0, legacy_port_flags, 0);
0203 }
0204 
0205 static int __init add_legacy_isa_port(struct device_node *np,
0206                       struct device_node *isa_brg)
0207 {
0208     const __be32 *reg;
0209     const char *typep;
0210     int index = -1;
0211     u64 taddr;
0212 
0213     DBG(" -> add_legacy_isa_port(%pOF)\n", np);
0214 
0215     /* Get the ISA port number */
0216     reg = of_get_property(np, "reg", NULL);
0217     if (reg == NULL)
0218         return -1;
0219 
0220     /* Verify it's an IO port, we don't support anything else */
0221     if (!(be32_to_cpu(reg[0]) & 0x00000001))
0222         return -1;
0223 
0224     /* Now look for an "ibm,aix-loc" property that gives us ordering
0225      * if any...
0226      */
0227     typep = of_get_property(np, "ibm,aix-loc", NULL);
0228 
0229     /* If we have a location index, then use it */
0230     if (typep && *typep == 'S')
0231         index = simple_strtol(typep+1, NULL, 0) - 1;
0232 
0233     /* Translate ISA address. If it fails, we still register the port
0234      * with no translated address so that it can be picked up as an IO
0235      * port later by the serial driver
0236      *
0237      * Note: Don't even try on P8 lpc, we know it's not directly mapped
0238      */
0239     if (!of_device_is_compatible(isa_brg, "ibm,power8-lpc") ||
0240         of_get_property(isa_brg, "ranges", NULL)) {
0241         taddr = of_translate_address(np, reg);
0242         if (taddr == OF_BAD_ADDR)
0243             taddr = 0;
0244     } else
0245         taddr = 0;
0246 
0247     /* Add port, irq will be dealt with later */
0248     return add_legacy_port(np, index, UPIO_PORT, be32_to_cpu(reg[1]),
0249                    taddr, 0, legacy_port_flags, 0);
0250 
0251 }
0252 
0253 #ifdef CONFIG_PCI
0254 static int __init add_legacy_pci_port(struct device_node *np,
0255                       struct device_node *pci_dev)
0256 {
0257     u64 addr, base;
0258     const __be32 *addrp;
0259     unsigned int flags;
0260     int iotype, index = -1, lindex = 0;
0261 
0262     DBG(" -> add_legacy_pci_port(%pOF)\n", np);
0263 
0264     /* We only support ports that have a clock frequency properly
0265      * encoded in the device-tree (that is have an fcode). Anything
0266      * else can't be used that early and will be normally probed by
0267      * the generic 8250_pci driver later on. The reason is that 8250
0268      * compatible UARTs on PCI need all sort of quirks (port offsets
0269      * etc...) that this code doesn't know about
0270      */
0271     if (of_get_property(np, "clock-frequency", NULL) == NULL)
0272         return -1;
0273 
0274     /* Get the PCI address. Assume BAR 0 */
0275     addrp = of_get_pci_address(pci_dev, 0, NULL, &flags);
0276     if (addrp == NULL)
0277         return -1;
0278 
0279     /* We only support BAR 0 for now */
0280     iotype = (flags & IORESOURCE_MEM) ? UPIO_MEM : UPIO_PORT;
0281     addr = of_translate_address(pci_dev, addrp);
0282     if (addr == OF_BAD_ADDR)
0283         return -1;
0284 
0285     /* Set the IO base to the same as the translated address for MMIO,
0286      * or to the domain local IO base for PIO (it will be fixed up later)
0287      */
0288     if (iotype == UPIO_MEM)
0289         base = addr;
0290     else
0291         base = of_read_number(&addrp[2], 1);
0292 
0293     /* Try to guess an index... If we have subdevices of the pci dev,
0294      * we get to their "reg" property
0295      */
0296     if (np != pci_dev) {
0297         const __be32 *reg = of_get_property(np, "reg", NULL);
0298         if (reg && (be32_to_cpup(reg) < 4))
0299             index = lindex = be32_to_cpup(reg);
0300     }
0301 
0302     /* Local index means it's the Nth port in the PCI chip. Unfortunately
0303      * the offset to add here is device specific. We know about those
0304      * EXAR ports and we default to the most common case. If your UART
0305      * doesn't work for these settings, you'll have to add your own special
0306      * cases here
0307      */
0308     if (of_device_is_compatible(pci_dev, "pci13a8,152") ||
0309         of_device_is_compatible(pci_dev, "pci13a8,154") ||
0310         of_device_is_compatible(pci_dev, "pci13a8,158")) {
0311         addr += 0x200 * lindex;
0312         base += 0x200 * lindex;
0313     } else {
0314         addr += 8 * lindex;
0315         base += 8 * lindex;
0316     }
0317 
0318     /* Add port, irq will be dealt with later. We passed a translated
0319      * IO port value. It will be fixed up later along with the irq
0320      */
0321     return add_legacy_port(np, index, iotype, base, addr, 0,
0322                    legacy_port_flags, np != pci_dev);
0323 }
0324 #endif
0325 
0326 static void __init setup_legacy_serial_console(int console)
0327 {
0328     struct legacy_serial_info *info = &legacy_serial_infos[console];
0329     struct plat_serial8250_port *port = &legacy_serial_ports[console];
0330     unsigned int stride;
0331 
0332     stride = 1 << port->regshift;
0333 
0334     /* Check if a translated MMIO address has been found */
0335     if (info->taddr) {
0336         info->early_addr = early_ioremap(info->taddr, 0x1000);
0337         if (info->early_addr == NULL)
0338             return;
0339         udbg_uart_init_mmio(info->early_addr, stride);
0340     } else {
0341         /* Check if it's PIO and we support untranslated PIO */
0342         if (port->iotype == UPIO_PORT && isa_io_special)
0343             udbg_uart_init_pio(port->iobase, stride);
0344         else
0345             return;
0346     }
0347 
0348     /* Try to query the current speed */
0349     if (info->speed == 0)
0350         info->speed = udbg_probe_uart_speed(info->clock);
0351 
0352     /* Set it up */
0353     DBG("default console speed = %d\n", info->speed);
0354     udbg_uart_setup(info->speed, info->clock);
0355 }
0356 
0357 static int __init ioremap_legacy_serial_console(void)
0358 {
0359     struct plat_serial8250_port *port;
0360     struct legacy_serial_info *info;
0361     void __iomem *vaddr;
0362 
0363     if (legacy_serial_console < 0)
0364         return 0;
0365 
0366     info = &legacy_serial_infos[legacy_serial_console];
0367     port = &legacy_serial_ports[legacy_serial_console];
0368 
0369     if (!info->early_addr)
0370         return 0;
0371 
0372     vaddr = ioremap(info->taddr, 0x1000);
0373     if (WARN_ON(!vaddr))
0374         return -ENOMEM;
0375 
0376     udbg_uart_init_mmio(vaddr, 1 << port->regshift);
0377     early_iounmap(info->early_addr, 0x1000);
0378     info->early_addr = NULL;
0379 
0380     return 0;
0381 }
0382 early_initcall(ioremap_legacy_serial_console);
0383 
0384 /*
0385  * This is called very early, as part of setup_system() or eventually
0386  * setup_arch(), basically before anything else in this file. This function
0387  * will try to build a list of all the available 8250-compatible serial ports
0388  * in the machine using the Open Firmware device-tree. It currently only deals
0389  * with ISA and PCI busses but could be extended. It allows a very early boot
0390  * console to be initialized, that list is also used later to provide 8250 with
0391  * the machine non-PCI ports and to properly pick the default console port
0392  */
0393 void __init find_legacy_serial_ports(void)
0394 {
0395     struct device_node *np, *stdout = NULL;
0396     const char *path;
0397     int index;
0398 
0399     DBG(" -> find_legacy_serial_port()\n");
0400 
0401     /* Now find out if one of these is out firmware console */
0402     path = of_get_property(of_chosen, "linux,stdout-path", NULL);
0403     if (path == NULL)
0404         path = of_get_property(of_chosen, "stdout-path", NULL);
0405     if (path != NULL) {
0406         stdout = of_find_node_by_path(path);
0407         if (stdout)
0408             DBG("stdout is %pOF\n", stdout);
0409     } else {
0410         DBG(" no linux,stdout-path !\n");
0411     }
0412 
0413     /* Iterate over all the 16550 ports, looking for known parents */
0414     for_each_compatible_node(np, "serial", "ns16550") {
0415         struct device_node *parent = of_get_parent(np);
0416         if (!parent)
0417             continue;
0418         if (of_match_node(legacy_serial_parents, parent) != NULL) {
0419             if (of_device_is_available(np)) {
0420                 index = add_legacy_soc_port(np, np);
0421                 if (index >= 0 && np == stdout)
0422                     legacy_serial_console = index;
0423             }
0424         }
0425         of_node_put(parent);
0426     }
0427 
0428     /* Next, fill our array with ISA ports */
0429     for_each_node_by_type(np, "serial") {
0430         struct device_node *isa = of_get_parent(np);
0431         if (of_node_name_eq(isa, "isa") || of_node_name_eq(isa, "lpc")) {
0432             if (of_device_is_available(np)) {
0433                 index = add_legacy_isa_port(np, isa);
0434                 if (index >= 0 && np == stdout)
0435                     legacy_serial_console = index;
0436             }
0437         }
0438         of_node_put(isa);
0439     }
0440 
0441 #ifdef CONFIG_PCI
0442     /* Next, try to locate PCI ports */
0443     for (np = NULL; (np = of_find_all_nodes(np));) {
0444         struct device_node *pci, *parent = of_get_parent(np);
0445         if (of_node_name_eq(parent, "isa")) {
0446             of_node_put(parent);
0447             continue;
0448         }
0449         if (!of_node_name_eq(np, "serial") &&
0450             !of_node_is_type(np, "serial")) {
0451             of_node_put(parent);
0452             continue;
0453         }
0454         /* Check for known pciclass, and also check whether we have
0455          * a device with child nodes for ports or not
0456          */
0457         if (of_device_is_compatible(np, "pciclass,0700") ||
0458             of_device_is_compatible(np, "pciclass,070002"))
0459             pci = np;
0460         else if (of_device_is_compatible(parent, "pciclass,0700") ||
0461              of_device_is_compatible(parent, "pciclass,070002"))
0462             pci = parent;
0463         else {
0464             of_node_put(parent);
0465             continue;
0466         }
0467         index = add_legacy_pci_port(np, pci);
0468         if (index >= 0 && np == stdout)
0469             legacy_serial_console = index;
0470         of_node_put(parent);
0471     }
0472 #endif
0473 
0474     DBG("legacy_serial_console = %d\n", legacy_serial_console);
0475     if (legacy_serial_console >= 0)
0476         setup_legacy_serial_console(legacy_serial_console);
0477     DBG(" <- find_legacy_serial_port()\n");
0478 }
0479 
0480 static struct platform_device serial_device = {
0481     .name   = "serial8250",
0482     .id = PLAT8250_DEV_PLATFORM,
0483     .dev    = {
0484         .platform_data = legacy_serial_ports,
0485     },
0486 };
0487 
0488 static void __init fixup_port_irq(int index,
0489                   struct device_node *np,
0490                   struct plat_serial8250_port *port)
0491 {
0492     unsigned int virq;
0493 
0494     DBG("fixup_port_irq(%d)\n", index);
0495 
0496     virq = irq_of_parse_and_map(np, 0);
0497     if (!virq && legacy_serial_infos[index].irq_check_parent) {
0498         np = of_get_parent(np);
0499         if (np == NULL)
0500             return;
0501         virq = irq_of_parse_and_map(np, 0);
0502         of_node_put(np);
0503     }
0504     if (!virq)
0505         return;
0506 
0507     port->irq = virq;
0508 
0509 #ifdef CONFIG_SERIAL_8250_FSL
0510     if (of_device_is_compatible(np, "fsl,ns16550")) {
0511         port->handle_irq = fsl8250_handle_irq;
0512         port->has_sysrq = IS_ENABLED(CONFIG_SERIAL_8250_CONSOLE);
0513     }
0514 #endif
0515 }
0516 
0517 static void __init fixup_port_pio(int index,
0518                   struct device_node *np,
0519                   struct plat_serial8250_port *port)
0520 {
0521 #ifdef CONFIG_PCI
0522     struct pci_controller *hose;
0523 
0524     DBG("fixup_port_pio(%d)\n", index);
0525 
0526     hose = pci_find_hose_for_OF_device(np);
0527     if (hose) {
0528         unsigned long offset = (unsigned long)hose->io_base_virt -
0529 #ifdef CONFIG_PPC64
0530             pci_io_base;
0531 #else
0532             isa_io_base;
0533 #endif
0534         DBG("port %d, IO %lx -> %lx\n",
0535             index, port->iobase, port->iobase + offset);
0536         port->iobase += offset;
0537     }
0538 #endif
0539 }
0540 
0541 static void __init fixup_port_mmio(int index,
0542                    struct device_node *np,
0543                    struct plat_serial8250_port *port)
0544 {
0545     DBG("fixup_port_mmio(%d)\n", index);
0546 
0547     port->membase = ioremap(port->mapbase, 0x100);
0548 }
0549 
0550 /*
0551  * This is called as an arch initcall, hopefully before the PCI bus is
0552  * probed and/or the 8250 driver loaded since we need to register our
0553  * platform devices before 8250 PCI ones are detected as some of them
0554  * must properly "override" the platform ones.
0555  *
0556  * This function fixes up the interrupt value for platform ports as it
0557  * couldn't be done earlier before interrupt maps have been parsed. It
0558  * also "corrects" the IO address for PIO ports for the same reason,
0559  * since earlier, the PHBs virtual IO space wasn't assigned yet. It then
0560  * registers all those platform ports for use by the 8250 driver when it
0561  * finally loads.
0562  */
0563 static int __init serial_dev_init(void)
0564 {
0565     int i;
0566 
0567     if (legacy_serial_count == 0)
0568         return -ENODEV;
0569 
0570     /*
0571      * Before we register the platform serial devices, we need
0572      * to fixup their interrupts and their IO ports.
0573      */
0574     DBG("Fixing serial ports interrupts and IO ports ...\n");
0575 
0576     for (i = 0; i < legacy_serial_count; i++) {
0577         struct plat_serial8250_port *port = &legacy_serial_ports[i];
0578         struct device_node *np = legacy_serial_infos[i].np;
0579 
0580         if (!port->irq)
0581             fixup_port_irq(i, np, port);
0582         if (port->iotype == UPIO_PORT)
0583             fixup_port_pio(i, np, port);
0584         if ((port->iotype == UPIO_MEM) || (port->iotype == UPIO_TSI))
0585             fixup_port_mmio(i, np, port);
0586     }
0587 
0588     DBG("Registering platform serial ports\n");
0589 
0590     return platform_device_register(&serial_device);
0591 }
0592 device_initcall(serial_dev_init);
0593 
0594 
0595 #ifdef CONFIG_SERIAL_8250_CONSOLE
0596 /*
0597  * This is called very early, as part of console_init() (typically just after
0598  * time_init()). This function is respondible for trying to find a good
0599  * default console on serial ports. It tries to match the open firmware
0600  * default output with one of the available serial console drivers that have
0601  * been probed earlier by find_legacy_serial_ports()
0602  */
0603 static int __init check_legacy_serial_console(void)
0604 {
0605     struct device_node *prom_stdout = NULL;
0606     int i, speed = 0, offset = 0;
0607     const char *name;
0608     const __be32 *spd;
0609 
0610     DBG(" -> check_legacy_serial_console()\n");
0611 
0612     /* The user has requested a console so this is already set up. */
0613     if (strstr(boot_command_line, "console=")) {
0614         DBG(" console was specified !\n");
0615         return -EBUSY;
0616     }
0617 
0618     if (!of_chosen) {
0619         DBG(" of_chosen is NULL !\n");
0620         return -ENODEV;
0621     }
0622 
0623     if (legacy_serial_console < 0) {
0624         DBG(" legacy_serial_console not found !\n");
0625         return -ENODEV;
0626     }
0627     /* We are getting a weird phandle from OF ... */
0628     /* ... So use the full path instead */
0629     name = of_get_property(of_chosen, "linux,stdout-path", NULL);
0630     if (name == NULL)
0631         name = of_get_property(of_chosen, "stdout-path", NULL);
0632     if (name == NULL) {
0633         DBG(" no stdout-path !\n");
0634         return -ENODEV;
0635     }
0636     prom_stdout = of_find_node_by_path(name);
0637     if (!prom_stdout) {
0638         DBG(" can't find stdout package %s !\n", name);
0639         return -ENODEV;
0640     }
0641     DBG("stdout is %pOF\n", prom_stdout);
0642 
0643     name = of_get_property(prom_stdout, "name", NULL);
0644     if (!name) {
0645         DBG(" stdout package has no name !\n");
0646         goto not_found;
0647     }
0648     spd = of_get_property(prom_stdout, "current-speed", NULL);
0649     if (spd)
0650         speed = be32_to_cpup(spd);
0651 
0652     if (strcmp(name, "serial") != 0)
0653         goto not_found;
0654 
0655     /* Look for it in probed array */
0656     for (i = 0; i < legacy_serial_count; i++) {
0657         if (prom_stdout != legacy_serial_infos[i].np)
0658             continue;
0659         offset = i;
0660         speed = legacy_serial_infos[i].speed;
0661         break;
0662     }
0663     if (i >= legacy_serial_count)
0664         goto not_found;
0665 
0666     of_node_put(prom_stdout);
0667 
0668     DBG("Found serial console at ttyS%d\n", offset);
0669 
0670     if (speed) {
0671         static char __initdata opt[16];
0672         sprintf(opt, "%d", speed);
0673         return add_preferred_console("ttyS", offset, opt);
0674     } else
0675         return add_preferred_console("ttyS", offset, NULL);
0676 
0677  not_found:
0678     DBG("No preferred console found !\n");
0679     of_node_put(prom_stdout);
0680     return -ENODEV;
0681 }
0682 console_initcall(check_legacy_serial_console);
0683 
0684 #endif /* CONFIG_SERIAL_8250_CONSOLE */
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